Re: gluster write performance

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These numbers are not helpfull without context : 
  • Raid level
  • Number of disks
  • nature & size of files
What do you get for this sample?
dd if=/dev/zero of=sample.txt bs=50M count=1

Test it accross differents cases to get a baseline:
  • Local disk on client
  • Locak disk on each brick
  • through gluster from client
Once you have your baseline, you can start to tune system and see changes based on it.


Cordialement,
Mathieu CHATEAU
http://www.lotp.fr

2015-07-18 22:11 GMT+02:00 Roman <romeo.r@xxxxxxxxx>:
But when I'm inside of VM, I'm getting 50-53 MB/s for replica and 120 MB for distributed volumes...
whats the logic? that slow write speed directly to mounted gfs volume slows down backup and restore process of VMs by VE.

2015-07-18 22:47 GMT+03:00 Roman <romeo.r@xxxxxxxxx>:
Hi,

Looked a lot from forums, but didn't find much..
So I've got glusterfs 3.6.4
1 Gbps network
replicate and distributed volumes

so when i read from any of them, I get maxed-out network performance (around 80-120 MB/sec)
If i write to distributed volume, I get 16 MB/sec
If i write to replicated volume, I get around half of it (which is logical) 8-10MB/sec

i use XFS (with all set recommended options) and EXT4 for gluster. no difference.
Disks are in HW RAID5 for Distributed volume and RAID0 for Replicated volume

volume options:

performance.write-behind: off
server.allow-insecure: on
cluster.server-quorum-type: server
cluster.quorum-type: auto
network.remote-dio: enable
cluster.eager-lock: enable
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off

Am I missing something?

--
Best regards,
Roman.



--
Best regards,
Roman.

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